At 250# I had 3 spokes bust in 1500 miles. The back wheel hub shaft was bending as well. I found some Mavic Aksium wheels on sale and have had no problems since. The bike would be great but I would beef up the wheels.

"Yesterday is history, tomorrow is a mystery, but today is a gift that is why it is called the present." - Kung Fu Panda

+1 on the busted spokes. I too have suffered the humiliation of walking my stock Sirrus 15 miles back from the far end of a bike path due to busted spokes. I replaced the stock wheels with Mavic bladed spoke wheels and after a break in period where the wheels needed a few tweaks to stay true, I am fine now.

The Sirrus is a great bike. The wheels aren't made for a clyde though. Better wheels, and a sprung seat were a great change for me. Also - the suspension seat post never worked at my weight. I replaced mine with a stock post when I put a sprung seat on. Now the bike rides great and I don't feel the road as much "in the end".